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Full text of "The manufacture and properties of iron and steel"

•INFLUENCE OP CERTAIN ELEMENTS ON STEEL.
347
TABLE XVII-C.
Properties of Steels Containing from .01 to .50 Per Cent. Silicon.*
NOTE.—All bars rolled well; they bent well both, hot and cold exceut No. 11, -which broke cold at an angle of 50°; they all welded perfectly: the differences in hardness were scarcely perceptible.

B I.
a
*
a a
If
top,
'
O fU
3d
.010 .061 .070 .092 .102 .121 .815 .247 .820 .882 •504
.16 .16 .15 .21 .18 .19 .18 .19 .15 .16 .18
.050 .028 .064 .084 .028 .064 .028 .028 .040 .042 .094
.oeo
.058 .051 .064 .066 .068 .057 .074 .081 .087 .121
.550 .619 ,500 .684 .662 .676
.490 .583
66394 70806 66102 75898 75197 71867 65901 77728 74435 79901 82258
74.3 70.8 71.8 66.6 68.4 71.2 72.4 64.0 67.1 69.8 71.7
28.1 20.4 22.9 19.4 20.6 21.9 24.8 17.6 16.7 18.0 19.4
48.8 40.7 6L5 44.1 61.4 48.7 56.6 49.6 86.1 80.7 84.8
This table cannot be called conclusive, for the carbon was determined by color instead of combustion, the number of tests is altogether too limited, and no account is taken of phosphorus, but there seems to be a strengthening .effect of about 80 pounds for every .01 per cent, of silicon up to a content of 4 per cent., while beyond this there is a deterioration of the metal, as shown in Table XVII-A. This would mean an increase of only 1600 pounds for .20 per cent, silicon, being one-third more than that produced by .01 per cent, of carbon. (See Table XVII-TJ.) It has been noted that A, which was the only bar containing an ordinary percentage of silicon, gave abnormal results in tensile strength, but this cannot be due to silicon, for the elastic ratio is normal, the elongation fair, and the reduction of area good.
An investigation into the effect of ordinary proportions of silicon •was conducted by Turner, and Table XVII-C gives the results as published in Journal I. and 8. I., Vol. II, 1888, p. 303. There are variations in the elements other than silicon, and the bad character of ISTo.' 11 may be explained by its high content of phosphorus. For better comparison Table XVII-D gives the averages of the
* Report of British Association, 1888.